1. Department of Pediatric Hematology, Oncology and Transplantology, Medical University of Lublin, University Children’s Hospital, Lublin, Poland
2. Department of Pediatric Cardiology, Medical University of Lublin, University Children’s Hospital, Lublin, Poland
3. Department of Pediatric Oncology, Hematology, and Transplantology, University of Medical Sciences, Poznań, Poland
4. Department of Transplantation, Clinical Immunology and Transplantation Polish-American Institute of Pediatrics, Jagiellonian University Medical College, Children’s University Hospital, Cracow, Poland
5. Department of Pediatric Hematology and Oncology, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland